1, The working principle and luminous efficiency of LED
LED (Light Emitting Diode) is a semiconductor device that emits light by exciting electrons in the semiconductor material through a current, causing them to transition from low energy levels to high energy levels. When electrons return to low energy levels, they release energy, manifested as light emission. The brightness of LED is directly related to the magnitude of the current. The higher the current, the more electrons are excited, and the stronger the light emitted.
However, the brightness of LEDs is not only determined by the magnitude of the current, but also by their luminous efficiency. Luminescence efficiency refers to the efficiency of LED in converting electrical energy into light energy, usually expressed in lumens per watt (lm/W). The higher the luminous efficiency of an LED, the brighter the light emitted at the same power.
2, The relationship between wattage and LED brightness
Watt (power) is the rate at which LED lighting fixtures consume electrical energy, usually measured in watts (W). In LED technology, the relationship between power and brightness is not simply proportional. This is because the luminous efficiency of different LED products varies, and even with the same power, LED lamps with higher luminous efficiency will be brighter.
For example, a 10 watt LED light fixture with a luminous efficiency of 100 lm/W emits a luminous flux of 1000 lumens (lm). And another LED light fixture with the same power of 10 watts, if its luminous efficiency is 150 lm/W, then its luminous flux is 1500 lumens. Obviously, in this case, the two LED lamps with the same power will have a brighter luminous efficiency.
3, The perception of brightness by the human eye
In addition, we also need to consider the perception of brightness by the human eye. The perception of different brightness levels by the human eye is not linear, but rather logarithmic. This means that when the brightness increases to a certain extent, the increase in brightness perceived by the human eye will tend to be gradual. Therefore, simply increasing the power of LED does not necessarily bring about a significant increase in brightness, especially in the high brightness range.
4, Comprehensive factor considerations
When selecting LED lamps, in addition to considering power and luminous efficiency, attention should also be paid to multiple factors such as lamp design, beam angle, and light source color. These factors will all affect the actual lighting effect of the lamp. For example, a well-designed lighting fixture can better utilize light and improve lighting efficiency; The beam angle determines the range of illumination and affects the uniformity of illumination; The color of the light source is related to the lighting atmosphere and visual effect.
